def test_devname_to_index(self):
self.assertEqual(devname_to_index('a'), 0)
self.assertEqual(devname_to_index('b'), 1)
self.assertEqual(devname_to_index('aa'), 26)
self.assertEqual(devname_to_index('ab'), 27)
self.assertEqual(devname_to_index('z'), 25)
self.assertEqual(devname_to_index('zz'), 701)
self.assertEqual(devname_to_index('zzz'), 18277)
def test_index_to_devname_and_back(self):
for i in range(18277):
self.assertEqual(i, devname_to_index(index_to_devname(i)))